Relay



Nov. 1o, 1942.

M. H. LINDERQTH ETAL RELAY Filed April l2, 1939y 2 lSheets-Sheet 1 N0v 10, 1942- M. H. LINDEROTH ET AL 2,301,894

RELAY Filed April l2, 1939 2 Sheets-Sheet 2 Fig. l0 66' Patented Nov. 10, 1942 RELAY oth and Karl Axel Lundkvist, Stockholm, Sweden, assignors to Telefon- Martin Herman Linder aktiebolaget L. M. Ericsson,

12, 1939, Serial No. 267,500

November 27, 1337 Application April In Sweden 6 Claims.

The present invention relates to relays of the kind which operate step by step.

In telephone systems two-steps relays are often used as combined line and cut-ofi relays. In such systems, particularly if not under supervision, special provisions must be made to prevent the initiation of a new call if a connection becomes released while the subscriber still has his microtelephone removed, or if the line is short-circuited or earthed due to a fault. In a system, in which the release of a talking connection is effected only after both subscribers have replaced their micro-telephones, the failure of one of the subscribers to replace his micro-telephone on completion of the conversation would prevent restoring of the selecting members and cause blocking oi the other subscriber. To eliminate such inconveniences time devices are often used which on the replacing of only one of the micro-telephones bring about auto-matic restoring of the selecting members upon the elapse of a predetermined time interval. The one o the sub scribers, which has his micro-telephone removed, would then, after the connection has been cut oii by the time device, engage new selecting members. To prevent such engaging of new selecting members connections including a special auxiliary relay have been used. It is one object of the present invention to attain said advantages in a simple way and without the use oi any auxiliary relay.

Additional objects and features 0i the invention will be more apparent from a consideration of the accompanying drawings and the following description wherein several exemplary embodiments of the invention are disclosed.

In the drawings:

Fig. l is a side elevation of a relay according to the invention.

Fig. 2 is a side elevation of a modication, the electromagnet and the armature not being shown.

Fig. 3 is a side elevation of a further modification.

Fig. 4 a relay according to the invention.

Figs. 5 to 7 show in side elevation a further modiiication, which is similar to the arrangement shown in Fig. l, the armature and other eiements being shown in three different positions.

Fig. 8 shows in side elevation another embodiment of the invention which operates on the same principle as the relay shown in Figs. 5 to '7.

Fig. 9 is a side elevation oi a further embodiment.

Stockholm, Sweden (Cl. Mil-135) shows a diagram of connection including LTA the extension 3 of the arm Fig. l!) is a iront View oi a shiftable arm used in the embodiment shown in Fig. 9.

Fig. 1l is a plan View of a contact spring used in the same embodiment.

Referring to Figure l, provided with two windings A and B. Pivotally mounted on a plate l serving as a support for the group ci springs is an arm 2, which is provided with an extension 3 and a shoulder The arm 2 is actuated by a spring fl which presses on the extension 3, striving to move the arm 2 to a vertical position. The arm 2 is held in the position shown by an abutment il provided on the contact spring 5 oi the group oi contact springs, said abutment Q pressing against the extension 3. When the armature El of the relay is attracted through the iirst step, or to an intermediate position, it wiil engage an abutment d on the Contact spring t' causing the spring 5 to be lifted so that said spring makes contact with the spring i. rEhe arm 2 remains unactuated since movement thereof is prevented by the engagement with an abutment t provided on the spring 'i'. When the armature is attracted through the second step, or when it moves to its fully attracted position, both Contact springs Ei and l are liited, the abutment 8 then releasing the arm i2 which is now permitted to take up a vertical position under the action of the spring il. A slit is provided in the spring 5 to render possible movement oi the arm The abutment 9 provided on the spring 5 cannot prevent movement of the arm 2, since after the spring 5 has been lifted said abutment no longer engages the extension When thereafter the armature returns irom its fully attracted to its intermediate position the spring l will be held in its lifted position by the abutment 8 resting on the shoulder ii oi the arm 2 while the spring 5 will follow the return movement oi the armature, so that when the armature has returned to its intermediate position the contact between the two springs ii and 'i will be interrupted. When thereafter the armature returns to its position of rest the abutment d on the spring 5 will press against 2 causing said arm to be shifted to the position shown, the Contact spring 'l being at the same time released and permitted to return to its position or" rest.

the relay illustrated is in the embodiment shown 1n Figure 2 there is pivotally mounted on the plate which is provided with a pin cess iii into which projects a spring tends to turn the arm i3 counter-clockwise. movement is prevented by an l an arm I3 i5 and w'th a reil which Said abutment i8 provided on the contact spring 1 as long as said spi. iff occupies its position of rest. When the armaure is attracted to its intermediate position the contact spring 5 is moved upwards so as to make contact with the Contact spring 1. When the armature thereafter moves to its fully attracted position both contact springs 5 and 1 will be lifted, so that the abutment I8 will not any longer lock the pin I5. The arm I3 can therefore turn counter-clockwise under the action of the spring I7 until the end of the pin I5 comes under the shoulder I2 on the abutment I8. When the armature thereafter returns from its fully attracted to its intermediate position the spring 1 will come to bear on the pin I5 through the intermediary of the abutment I 8, and when the armature has returned to its intermediate position the Contact between the springs 1 and 5 will be interrupted. When the armature returns from its intermediate position to its position of rest the spring 5 will also return to its position of rest, then actuating by means of an abutment I9 provided thereon the arm I3 so that said arm is restored to the position shown.

In the embodiment shown in Figure 3 an arm 28 provided with shoulders or abutting surfaces 2I and 22 is pivotally mounted on a spring 23 appertaining to the group of Contact springs. The abutting surfaces 2i and 22 are adapted to cooperate with an abutment 24 provided on the U contact spring 5. The abutment 24 bears on the abutting surface ZI when the armature of the relay occupies its position of rest. When upon energization of the relay the armature is attracted to its intermediate position actuating the Contact spring the arm 25 will move the ccntact spring 5 upwards, causing the latter to make contact with the contact spring 1. The arm 29 is provided with a projecting pin 25 adapte-d to cooperate with two springs and 21, the spring 26 serving to hold the arm in the position shown when the armature of the relay occupies its position of rest and its intermediate position. When thereafter the armature is shifted to its fully attracted position while moving the spring 23 further upwards, the pin 25 will strike against the spring 21, causing the arm 2G to turn counterclockwise, so that the abutment 24 will come to rest against the abutting surface 22. The springs 5 and 1 thus do not follow the armature when i moving from its intermediate to its fully attracted position. When thereafter` the armature returns from its fully attracted to its intermediate position the contmt between the` springs 5 and 'I will be interrupted, because the abutment 24 now rests on the abutting surface 22 of the arm 25. During the return of the armature from its intermediate position to its position of rest the spring 25 will engage the spring 26, returning the arm 25 to the position shown.

Figures 5 to '1 show a further embodiment which is similar to the arrangement shown in Figure l. The arm 35, which is provided with a flange 34, is held in a vertical position under the action of a spring 36, however, when the armature occupies its position of rest (Figure 5), the spring 1 then resting on the arm 35 through the intermediary of the abutment 31, so that the contact between the springs 5 and 1 is then interrupted. When the armature is attracted to its intermediate position, a resilient pin 33 provided on the armature 38 engages the flange 34 of the arm 35, so that the arm is shifted to the position shown in Figure 6 in which position said arm is locked by the abutment 37 Secured on the spring 1. The spring 1 is then bent downwards so that contact is made between the springs 5 and 1. When thereafter the armature is moved to its fully attracted position the contact springs 5 and 1 are lifted to the position shown in Figure 7 wherein the abutment 31 no longer blocks the arm 35, whereby the latter returns to its vertical position under the action of the spring 35. In said position the contact springs 5 and I are closed. When thereafter the armature returns to its position of rest the spring 'I will again engage the arm by means of the abutment 31, causing the two springs 5 and 1 to take up the position shown in Figure 5, or the position in which the contact between the springs is interrupted. The ange 34 of the arm 35 cannot prevent the return of the armature to the position of rest, since during the return movement the resilient pin 39 will snap over the bevelled edge of said flange.

Figure 8 shows another embodiment of the invention, which operates on the same principle as the relay shown in Figure 5. The arm 4U, which is pivotally mounted on the pin 4I, is provided with a recess or opening 42 in which an abutment 43 on the spring 1 is received. The arm 4D is held in the position shown by means of a spring wound on the pin 4i, one end 44 of said spring engaging the supporting plate 45 and the other end 4B of said spring engaging an arm 41, which is bent through a right angle and projects through an opening 49 in the arm 43, said bent arm 41 being pivoted on a pin 48 secured in the arm 40. In the embodiment shown the arm 40 is actuated by a spring 5G of the group of springs, said spring being provided with an opening 5I through which the arm 4I! projects. When the armature is attracted to its intermediate position the spring 50 is bent upwards, the arm 40 then turning about the pin 4I through cooperation between the spring 5D and the arm 41 so that under the influence of the resiliency of the spring 1 the abutment 43 will slide past the arm 40 in substantially the same manner as described in the previous embodiment. The spring 1 is then moved downwards, making contact with the spring 5. When the armature moves to its fully attracted position the spring 5D is moved further upwards, lifting the bolt 54, the springs 5 and 1, and the abutment 43, the arm 40 then returning to its position of rest, the abutment 43 will again engage the arm 40. The arm 47 cannot prevent the spring 5D from returning to its position of rest, since the same, through the pressure from the right hand edge 52 of the opening 5I in the spring 50, is turned about the pin 4S so that the arm 41 is inserted so far into the opening 49 of the arm 43 against the action of the spring 46 that the bevelled edge 52 of the recess 5I can slide over the outer end of the arm 41. rlhe arm 4i! then remains in its position of rest.

Figures 9 to 11 show a further embodiment in which one of the springs 5 is tensioned so as to have a tendency to move in the direction towards the spring 1. When the armature occupies its position of rest, the spring 5 is. depressed by an abutment GI mounted on a spring 52 and provided with a pin which projects through an opening in the spring 5. On said spring 52 there is also mounted the angular arm 53 which is provided at its lower end with a tongue 54, Figure 10, and cooperates at its upper end with abutments 68 and 69 provided on a stiii spring 10..

The tenere fi?! projects through an opening G5 ring 5, sai-d opening being provided with Figure When the spring t2 occupies .its pasaron of rest, the tongue 'Lili will be positioned in the wider portion of the opening Sii. When the armature is attracted to its middle position, the abutment 6I is lifted, releasing the spring 5 sc that the latter contacts with the spring L The arm 53 pivotally mounted on the spring 62 is then also carried upwards, yet without the upper portion of the arm engaging with the abutment G8. When the armature moves to its fully attracted position, the spring 52 is lifted further, the upper portion of the arm 63 then engaging with the abutment 68, which results in that the arm 63 is turned counter-clockwise, moving the tongue @4 into the slot 61. When thereafter the armature returns from its fully attracted position to its intermediate position the abutting surfaces 55 on the arm 63, Figure 10, will press against the spring 5, moving the latter downwards so that the contact with the spring 1 is interrupted. Also in said embodiment there will thus occur an interruption of the contact between the contact springs 5 and 1 when the armature returns to its intermediate position after having been fully energized. When thereafter the armature returns from. its intermediate position to its position of rest, the upper bent portion of the arm S3 will strike against the abutment 69, the arm 53 being then turned back to the position shown, bringing the tongue 'E4 back to the wider portion of the opening 56. In said position the abutment 5l holds the spring 5 depressed.

Figure 4 is a diagram of connections showing the two windings A and B of a relay connected to a subscriber in an automatic telephone system. Upon receipt of an incoming call over the lines a. and b the winding A will be energized over the contacts 32 and 33, and the contact between the springs 5 and 'E will then close. The relay C then starts the call finders over the contact 30. The ohmic resistance of the relay C is of sufficient magnitude to prevent the winding B from being energized. When the call has been` located by a finder in known manner, the winding B is energized, the armature being moved through the second step to its fully attracted position, interrupting the contacts 3l, 32 and 33. If the connection is then released, while the microphone of one subscriber is still removed the winding B will be deenergized and only the winding A remains energized, whereby the armature returns from its fully attracted to its intermediate position in which, as mentioned above, the contacts 5 and 1 are open insuring that no other call can be initiated.

The spring group of the relay comprises also contact springs for the contacts 3|, 32, 33 although only the springs 5 and 1 have been shown.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is:

1. In a step by step operated relay, Contact springs, an arm shiftable to two positions and adapted to cooperate with the contact springs, an armature movable in two steps, means striving to shift said arm to a position in which at least one of the springs can rest thereagainst, means arranged on one of the springs adapted to prevent the arm from taking said position, said means being adapted to shift said arm to such a position during the movement of the armature from a first to a second step that the actuation of the contact springs effected during the shifting of the armature from a position of rest to a first step will be nullified when the armature returns from the second to the first step.

2. In a step by step operated relay, contact springs, an arm shiftable to two positions and adapted to cooperate with the Contact springs, means striving to shift said arm to a position in which at least one of the springs can rest thereagainst, an armature movable in two steps, means arranged on one of the springs adapted to prevent the arm from taking said position until the armature is shifted from its first to the second step, and means adapted to shift said arm from said position in which said springs can rest thereagainst upon return of the armature to its position of rest from its first step.

3. In a step by step operated relay, contact springs, a plate serving as a support for the contact springs, an arm shiftable to two positions and adapted to cooperate with said Contact springs, said arm being pivotally mounted on said plate, a spring arranged in the group of the Contact springs and striving to shift said arm to a position in which at least one of the springs can rest thereagainst, an armature movable in two steps, means arranged on one of the springs adapted to prevent the arm from taking said position until the armature is shifted from its first to the second step, and means adapted to shift said arm from said position in which said springs can rest thereagainst upon return of the armature to its position of rest from its rst step.

4. In a step by step operated relay, an arm shiftable to two positions, an armature, contact springs, means striving to shift said arm to a position in which at least one of said springs can rest thereagainst, means on the armature adapted to shift said arm from said position on the attraction of the armature to an intermediate position, said contact spring thereby being released and moved to a new position, and means on said springs adapted to lock said arm in the shifted position.

5. In a step by step operated relay, an arm shiftable to two positions, contact springs, an abutment arranged on one of the contact springs, means striving to shift said arm to a position in which said abutment can rest thereagainst, an armature, a resilient member mounted on the armature and adapted to shift said arm from said position on the attraction of the armature to an intermediate position, said abutment with said contact spring thereby being released and moved to a new position, and said abutment being adapted to lock said arm in the shifted position.

6. In a step by step operated relay, an arm shiftable to two positions, contact springs, an abutment arranged on one of the contact springs, means striving to shift said arm to a position in which said abutment can rest thereagainst, an armature, means adapted to shift said arm from said position on the attraction of the armature to an intermediate position, said abutment with said contact spring thereby being released and moved to a new position, said abutment being adapted to lock said arm in the shifted position, a blade spring arranged in the group of the contact springs and being actuated by said armature and said shifting of said arm being effected by said blade spring.

MARTIN HERMAN LINDEROTH. KARL AXEL LUNDKVIST. 

